/*
 * MIT License
 *
 * Copyright (c) 2021 zuoyuip@foxmail.com
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package top.zuoyu.mybatis.utils;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StringWriter;

import org.springframework.lang.NonNull;

/**
 * 字符串工具类 .
 *
 * @author: zuoyu
 * @create: 2021-10-17 17:11
 */
public class StrUtil {

    /**
     * 将字符串的首字母转大写
     *
     * @param str 需要转换的字符串
     * @return 转换的字符串
     */
    @NonNull
    public static String captureName(@NonNull String str) {
        // 进行字母的ascii编码前移，效率要高于截取字符串进行转换的操作
        char[] cs = str.toCharArray();
        if (Character.isLowerCase(cs[0])) {
            cs[0] -= 32;
            return String.valueOf(cs);
        }
        return str;
    }

    public static String getStringFromStream(InputStream is) throws IOException {
        if (null == is) {
            return null;
        }
        try {
            InputStreamReader reader = new InputStreamReader(is);
            char[] buffer = new char[1024];
            StringWriter writer = new StringWriter();
            int bytesRead;
            while ((bytesRead = reader.read(buffer)) != -1) {
                writer.write(buffer, 0, bytesRead);
            }
            return (writer.toString());
        } finally {
            is.close();
        }
    }
}
